package com.example.注解和反射.reflection;

import java.lang.reflect.Constructor;
import java.lang.reflect.Field;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;

public class Test08 {
    public static void main(String[] args) throws ClassNotFoundException, InstantiationException, IllegalAccessException, NoSuchMethodException, InvocationTargetException, NoSuchFieldException {
        //获得class对象
        Class c1 = Class.forName("com.example.注解和反射.reflection.User");

        //构造一个对象
        //本质是调用了类的无参构造器
//        User user = (User) c1.newInstance();
//        System.out.println(user);

        //通过构造器创建对象
        Constructor constructor = c1.getDeclaredConstructor(Integer.class, String.class, String.class);
        User user2 = (User) constructor.newInstance(1, "admin", "123456");

        System.out.println(user2);

        //通过反射调用普通方法
        User user3 = (User) c1.newInstance();
        Method setName = c1.getDeclaredMethod("setName", String.class);
        setName.invoke(user3,"狂神01");
        System.out.println(user3.getName());

        //通过反射操作属性
        System.out.println("=========");
        User user4 = (User) c1.newInstance();
        Field name = c1.getDeclaredField("name");
        //不能直接操作私有属性，需要关闭程序的安全检测，属性或方法的setAccessible(true)
        name.setAccessible(true);
        name.set(user4,"狂神02");
        System.out.println(user4.getName());

    }
}
